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Journal Articles Industrial Biotechnology Year : 2015

Evaluation of Antioxidant Cellulose Nanocrystals and Applications in Gellan Gum Films

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Abstract

The research described herein shows the treatment of cellulose nanocrystals (CNCs) led to antioxidant properties after 2 h of interaction with a redox pair—hydrogen peroxide (H2O2) and ascorbic acid (AA)—and 20 kGy irradiation. This procedure enhanced the surface of CNCs to react for 24 h with the antioxidant gallic acid (GA) at different mass ratios of CNC/GA (R=0.66 and 8). Each step of the modification was evaluated, but optimal results were found on CNC-H2O2-AA-γ-GA. Different analysis such as Fourier transform infrared spectroscopy exposed the apparition of a new band at 1730 cm−1, which can be explained by the formation of carbonyl groups on CNC. By studying the ultraviolet spectra of the different solutions, it was noticed that at wavelengths ∼290-nm intensity increases, showing a possible formation of aldehyde and carboxylic acids groups. This latter group was evaluated via conductometric titration, observing that CNC-H2O2-AA-γ-GA possesses 132 mmol COOH/kg and 8 mM Trolox eq/mL solution. A reduction in the thermal stability of CNC-H2O2-AA-γ-GA was found with thermogravimetric analysis, which confirms changes to the CNC surface. A 20% solution of the modified CNC-H2O2-AA-γ-GA was introduced onto a gellan gum matrix to create antioxidant film applications and enhanced mechanical properties. Improved (p≤0.05) tensile strength, tensile modulus, and water vapor permeability were observed with a decrease at the elongation at break in the film packaging formulation.
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Dates and versions

pasteur-01351914 , version 1 (04-08-2016)

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Paula Criado, Carole Fraschini, Stephane Salmieri, Dorra Becher, Agnes Safrany, et al.. Evaluation of Antioxidant Cellulose Nanocrystals and Applications in Gellan Gum Films. Industrial Biotechnology, 2015, 11 (1), pp.59-68. ⟨10.1089/ind.2014.0017⟩. ⟨pasteur-01351914⟩

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